Astronomers are investigating the possibility of a hidden ninth planet beyond Neptune, which could explain unusual orbital patterns in the Kuiper Belt.

Brown, a professor of planetary astronomy at Caltech, discovered another small world called Eris in the Kuiper Belt — a vast ring of icy objects beyond ... a solar system without the hidden ...

MIT researchers analyzed precious samples from the asteroid Ryugu, delivered to Earth by Japan’s Hayabusa2 mission. They looked for clues of an ancient magnetic field.

5️⃣ ‘Saddest thing’: When crews in Rome built a tiny temporary pool in front of the famous Trevi Fountain for tourists to ...

The Arecibo Message as it appears when its 1,679 bits are properly aligned on a grid (left), an annotated illustration ...

Now, over 45 years later, these incredible probes are detecting something mysterious beyond the edge of our solar system ... races as they're called 28 Things Most Retirees Don’t Know ...

"Solar System: Icy Worlds." Right now, on "NOVA." ♪ ♪ ♪ ♪ NARRATOR: Out in the dark expanse of our Solar System, far beyond Earth ... really discovering new things every day.

Many now believe that the U.S. could descend into political violence. Some are joining survivalist communities, canning ...